Change ), You are commenting using your Facebook account. Cubic feet per minute (CFM) and standard cubic feet per minute (SCFM) describe the volume of air a compressor delivers at specific PSI levels. Compressed air is an on-site generated utility. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. The positive displacement types have different values depending on how efficient the design. for pipes ranging size 1/8" to 1/2" - pressure drop 10% of applied pressure per 100 feet of pipe, for pipes ranging size 3/4" to 3" - pressure drop 5% of applied pressure per 100 feet of pipe, en: compressed air pipeline pressure drop flow capacity scfm. Still, contributor J's right that your compressor is undersized for any significant amount of spraying. For example, our air compressors have the main motor (350hp) which pump the air, then another smaller one (15 – 20 hp) that spins a fan to cool the air and oil. These applications will - due to browser restrictions - send data between your browser and our server. It is important to know the cost of compressed air at your facility. You can get away with it by spraying one small piece, wait for the tank to fill and stop running, then spray your next piece and so on. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. In compressed air, this means it is a measure of the flow or output rate that air is coming out of your compressor. If you know the type of air compressor that you have, you can calculate the amount of compressed air that you can produce per horsepower. Sorry, your blog cannot share posts by email. But like I said, if this is a one time thing, you can get away with it. A real 3HP compressor is going to produce something more like 12 CFM at 90 PSI. Forum Responses There are two types of air compressors, positive displacement and dynamic. How to Calculate Decibel Levels, Estimating the Total Cost of Compressed Air. The reason for the question is that I am looking to run an HLVP conversion gun that requires 11cfm at 23psi. June 30, 2009. Your tank is full at 130psi, you start to spray, compressor kicks on at 90psi. The tank will drain very quickly when spraying and will start to fill. As you can see, by just adding the EXAIR nozzle to the end of the pipe, the company was able to save $1,872 per year. You can target the Engineering ToolBox by using AdWords Managed Placements. When I looked into appropriate equipment, I decided that a three-horse compressor was about as small as you could go for regular HVLP use, and that's real cfm, not the bogus "peak" output ratings they assign to cheap homeowner compressors. Your gun is asking for 23psi (dynamic pressure) so the restrictor/gauge on your gun probably needs to be set at around 40 psi without the trigger pulled. Search (800) 222-4553 With a 30 gallon tank and spraying small jobs like cabinet doors can a compressor rated at 5.5cfm at 90psi with a 30 gallon tank be rated at 130psi? The type of air compressor can help in the amount of compressed air that can be produced by the electric motor. The type of air compressor can help in the amount of compressed air that can be produced by the electric motor. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! What is CFM in Compressed Air? I will share a comparison to a 1/8” NPT pipe to an EXAIR Mini Super Air Nozzle. John Ball The balloon now has 2 Actual Cubic Feet, 2 ACF, but still has only 1 Standard Cubic Foot, 1 SCF. Post was not sent - check your email addresses! Most people think that compressed air is free, but it is most certainly not. ( Log Out /  In both equations, you can substitute your information to see what you actually pay to make compressed air each year at your facility. Higher horsepower creates greater air pressure, measured in PSI. As a unit of conversion, there are 0.746 KW in 1 hp. The air compressor that they have is a 100 hp rotary screw. Compressed air is one of the most expensive sources of energy in a plant. You need air flowing out of your gun when you set it at 23psi. For a single-acting piston type air compressor, the amount of air is between 3.1 to 3.3 CFM/hp. For example, an AL cylinder of pure helium may contain 134 cu. From contributor J: The electrical rate for this facility is at $0.08/KWh. - free apps for offline use on mobile devices. In a high-pressure cylinder, the volume will be affected by the content's compressibility factor Z (PV = ZnRT). I guess my question is can a full tank at 135 psi deliver more than the top rating at 90 psi until the tank pressure drops to 90 or below? These smaller motors do have some kind of consumption value and should be taken into account…IF the manufacturer has not already included them in their kWh consumption or efficiency values. Typical lifetime compressed air costs in perspective. motor efficiency – average for an electric motor is 95%. Ci means cubic inches therefore a smaller unit of measurement than Cu ft or cubic foot. As an average, EXAIR uses 4 CFM/hp of air compressor when speaking with customers who would like to know the general output of their compressor. L = length of pipe in feet (ft) The horsepower required to drive air through a pipe equals the volume of air in cubic feet per second multiplied by the pressure in pounds per square foot, and this product divided by … With these factors, the annual cost can be calculated by Equation 1: 100hp * 0.746 KW/hp * 1,000hr * $0.08/KWh / 0.95 = $6,282 per year. ft. under the same conditions. Only emails and answers are saved in our archive. Still, contributor J's right that your compressor is undersized for any significant amount of spraying. AddThis use cookies for handling links to social media. With this information, we can estimate the total cost to make compressed air as shown in Equation 3: C – Cost of compressed air ($ per 1000 cubic feet). Question See where this is going, 20 seconds of spray time, to then have to wait a minute to fill. While the dynamic type of air compressor is roughly 3.7 – 4.7 CFM/hr. Change ), You are commenting using your Twitter account. With the equations above, you can calculate how much you are paying. From the diagram above the capacity of a 1" pipe line at pressure 7 bar is approximately 60-70 liter/s. The balloon is taken into a hotter temperature, and the gas expands to 2 cubic feet because of reacting to the heat. Google use cookies for serving our ads and handling visitor statistics. It will work, but won’t work well. We have 10 air compressors in our plant and I’m in the process of calculating the total annual cost for the system. EXAIR’s High Power Cold Gun Keeps Saw Blade Cool in Mining Operation, Sound – It Adds Up! ( Log Out /  Change ). Making compressed air is expensive, so why would you not use it as efficiently as you can. I will try and explain the function. Cookies are only used in the browser to improve user experience. What other hard costs are associated with air compressor systems and how do you calculate them? These are very inefficient for compressed air and can cost you a lot of money. Some of our calculators and applications let you save application data to your local computer. So, we can determine the energy cost to spin the electric motors. If you need any help to try and find a way to be more efficient with your compressed air system, please contact an Application Engineer at EXAIR. (Reference below). ft. of gas while the same cylinder of pure air may contain 144 cu. If your air compressor has a unit of horsepower, or hp, you can use Equation 1: hp * 0.746 * hours * rate / (motor efficiency). So, if you have a 10 hp single-acting piston, you can produce between 31 to 33 CFM of compressed air. As you can see, the double-acting air compressor can produce more compressed air at the same horsepower. Multiply that times your volume above, 1.33681 Cubic Feet, and you get: 9.17 ATM x 1.33681 CF in container = 12.3 Cubic Feet of air contained in the 10 gallon container at 120 PSI.

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